Equus 3110 - CanOBD2 Diagnostic Tool - Manual (Page 21)

CAN OBD2 19
E
Onboard Diagnostics
COMPUTER ENGINE CONTROLS
■ Monitor Has/Has Not Run - The terms “Monitor has run” or
“Monitor has not run” are used throughout this manual. “Monitor
has run,” means the PCM has commanded a particular Monitor to
perform the required diagnostic testing on a system to ensure the
system is operating correctly (within factory specifications). The
term “Monitor has not run” means the PCM has not yet com-
manded a particular Monitor to perform diagnostic testing on its
associated part of the emissions system.
■ Trip - A Trip for a particular Monitor requires that the vehicle is being
driven in such a way that all the required “Enabling Criteria” for the
Monitor to run and complete its diagnostic testing are met. The “Trip
Drive Cycle” for a particular Monitor begins when the ignition key is
turned “On.” It is successfully completed when all the “Enabling
Criteria” for the Monitor to run and complete its diagnostic testing
are met by the time the ignition key is turned “Off.” Since each of
the eleven monitors is designed to run diagnostics and testing on a
different part of the engine or emissions system, the “Trip Drive
Cycle” needed for each individual Monitor to run and complete
varies.
■ OBD 2 Drive Cycle - An OBD 2 Drive Cycle is an extended set of
driving procedures that takes into consideration the various types of
driving conditions encountered in real life. These conditions may
include starting the vehicle when it is cold, driving the vehicle at a
steady speed (cruising), accelerating, etc. An OBD 2 Drive Cycle
begins when the ignition key is turned “On” (when cold) and ends
when the vehicle has been driven in such a way as to have all the
“Enabling Criteria” met for all its applicable Monitors. Only those
trips that provide the Enabling Criteria for all Monitors applicable to
the vehicle to run and complete their individual diagnostic tests
qualify as an OBD 2 Drive Cycle. OBD 2 Drive Cycle requirements
vary from one model of vehicle to another. Vehicle manufacturers
set these procedures. Consult your vehicle’s service manual for
OBD 2 Drive Cycle procedures.
Do not confuse a “Trip” Drive Cycle with an OBD 2 Drive
Cycle. A “Trip” Drive Cycle provides the “Enabling Criteria” for
one specific Monitor to run and complete its diagnostic test-
ing. An OBD 2 Drive Cycle must meet the “Enabling Criteria”
for all Monitors on a particular vehicle to run and complete
their diagnostic testing.
■ Warm-up Cycle - Vehicle operation after an engine off period
where engine temperature rises at least 40°F (22°C) from its tem-
perature before starting, and reaches at least 160°F (70°C). The
PCM uses warm-up cycles as a counter to automatically erase a
specific code and related data from its memory. When no faults
related to the original problem are detected within a specified num-
ber of warm-up cycles, the code is erased automatically.